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According to this Bloomberg article, some of them are suspicious of it:

https://www.bloomberg.com/news/articles/2021-09-07/bitcoin-faces-biggest-test-as-el-salvador-makes-it-legal-tender

a poll last week by El Salvador’s Universidad Centroamericana Jose Simeon Canas found his Bitcoin law is widely unpopular. Two-thirds of respondents said the law should be repealed while more than 70% said they prefer to use U.S. dollars instead.

But it looks like the government is giving people pre-loaded wallets with $30 worth of bitcoin if they sign up with their national ID. It's free money, I imagine most people with sign up.